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PR-23 instrucon manual
5.4.4 Diagnosc values
The values at the left of the graph are used for diagnostic purposes:
− CONC is the inal concentration value including Field calibration adjustment, see
Figure 6.12.
− TEMP, see Section 5.4.5.
− CCD gives the position of the shadow edge on CCD in %.
− nD is the refractive index value n
D
from the sensor.
− CALC is the calculated concentration value without Field calibration adjustment,
Section 6.4.3
− QF or Quality Factor is a value in the range 0–200. It measures the image sharp-
ness, a typical good value is 100. A QF value below 40 usually indicates prism
coating.
− LED is a measure of the amount of light from the light source in %. Should be below
100 %.
− HD TMP = sensor head temperature, see Section 5.4.5.
− HD HUM = sensor head humidity, see Section 5.4.6.
− I_SNS value shows the current to sensor, the nominal value is 40 mA.
− DTR TMP = Indicating transmitter temperature, see Section 5.4.5.
− DTR V1 gives the voltage from the power module, the nominal value is 24V.
− DTR V2 gives the DC supply voltage, the nominal value is 3.3 V.
Note: The Slope display also has a soft key SENSOR RESTART which can be used to
restart the current sensor (see upper left corner of the display for sensor letter) after
a sensor software update.
5.4.5 Temperature measurement
The system contains three different temperature measurements displayed to the left
of the graphs in Figure 5.8:
TEMP is the process temperature used for automatic temperature compensation in the
Indicating transmitter (Section 6.4, “Calibrating the concentration measurement”).
HD TMP measures the temperature on the Sensor processor card PR-10100 (Fig-
ure 2.1).
DTR TMP measures the temperature on the Motherboard of the Indicating transmitter
(Figure 3.7, “Motherboard of the Indicating transmitter for AC power”).
Both sensor head temperature and DTR temperature are monitored by the built-in
diagnostics program, see Sections 8.1.8, “Message HIGH SENSOR TEMP”, and 8.1.9, “Message
HIGH TRANSMITTER TEMP”.
5.4.6 Sensor head humidity
The Sensor processor card contains also a humidity sensor. The value HD HUM is the
relative humidity inside the Sensor. It is monitored by the diagnostics program, see
Section 8.1.7, “Message HIGH SENSOR HUMIDITY”.
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